Drainboard



FIG. 1 is a perspective view of a drainboard design;

FIG. 2 is a top view of the drainboard in FIG. 1;

FIG. 3 is a front view of the drainboard in FIG. 1;

FIG. 4 is a side view of the drainboard in FIG. 1;

FIG. 5 is a back view of the drainboard in FIG. 1; and,

FIG. 6 is a bottom view of the drainboard in FIG. 1. 

We claim the ornamental design for a drainboard, as shown. 